A solid superacid catalyst was evaluated for the production of fatty acid methyl esters (FAMEs) from acid oil containing about 60 wt.% free fatty acids. It was demonstrated that /ZrO2-TiO2/La3+ was an effective catalyst for simultaneous transesterification and esterification. The optimization...

Fabrication of structures on the micro- and nanometer scales is of great importance for both fundamental research and potential applications. While microlithography methods are relatively established, the production of multi-component micro- and nanostructures with high density still presents...

It is discovered that there are two important characters, local-world character and weight-driven character, in many real-life complex networks. Motivated by this fact, a weight-driven local-world network model is proposed, which incorporates the weight dynamics and the fixed local-world...

Prior research suggests that participating in corporate social responsibility (CSR) activities can lead to higher future productivity. However, the empirical evidence is still scarce. The purpose of this study is to examine the relationship between CSR and future firm productivity in the U.S....

Details about the movement of trucks on postal express lines are investigated to improve the performances of mail distribution. A mixed driving pattern of trucks is introduced to minimize the transportation cost of a postal express line network with a service level requirement. We formulate this...